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0 <br />1 <br />analyses, both precision and accuracy measurements, are compared with <br />control limits using Shewhart procedures as presented in the 1972, 1979 <br />editions of the U.S. EPA/EMSL Handbook for Analytical Quality Control in <br />Water Wastewater Laboratories. <br />0 <br />n <br />P <br />0 <br />C <br />i <br />C <br />C <br />u <br />PJI 9390301 18 <br />i <br />